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Convertible Notes and Credit Facilities - Additional Information (Detail)
12 Months Ended
Dec. 14, 2015
shares
Dec. 31, 2018
USD ($)
$ / shares
shares
Dec. 31, 2017
USD ($)
$ / shares
shares
Dec. 31, 2016
shares
Dec. 31, 2015
USD ($)
day
$ / shares
Sep. 29, 2017
USD ($)
Debt Instrument [Line Items]            
Debt Instrument, Face Amount   $ 128,250,000 $ 128,250,000   $ 128,250,000  
Debt Instrument, Interest Rate, Stated Percentage   4.00%     4.00%  
Common Stock, Par Value Per Share | $ / shares   $ 0.001 $ 0.001   $ 0.001  
Debt Instrument, Convertible, Conversion Ratio         173.9978  
Debt Conversion, Converted Instrument, Amount         $ 1,000  
Debt Instrument, Convertible, Conversion Price | $ / shares   $ 5.75     $ 5.75  
Stock Repurchased and Retired During Period, Shares | shares   0 0 0    
Debt Issuance Cost         $ 4,100,000  
Percentage Of Principal Amount Of Convertible Notes Is Equal To Repurchase Price         100.00%  
Loans Payable to Bank [1]   $ 18,783,000 $ 20,565,000      
Debt Instrument, Convertible, Carrying Amount of Equity Component   26,062,000 26,062,000      
Stock price greater or equal 130 percent of Note Conversion Price [Member]            
Debt Instrument [Line Items]            
Debt Instrument, Convertible, Threshold Trading Days | day         20  
Debt Instrument, Convertible, Threshold Consecutive Trading Days | day         30  
Debt Instrument, Convertible, Threshold Percentage of Stock Price Trigger         130.00%  
Note price less than 98 percent of stock price times conversion rate [Member]            
Debt Instrument [Line Items]            
Debt Instrument, Convertible, Threshold Trading Days | day         5  
Debt Instrument, Convertible, Threshold Consecutive Trading Days | day         5  
Debt Instrument, Convertible, Threshold Percentage of Stock Price Trigger         98.00%  
Revolving Credit Facility [Member] | Silicon Valley Bank [Member]            
Debt Instrument [Line Items]            
Line of Credit Facility, Current Borrowing Capacity   15,000,000       $ 15,000,000
Outstanding Borrowing Limit Based on Eligible Receivables, Percentage           85.00%
Minimum Net Worth Required for Compliance   20,000,000        
Minimum Liquidity Amount on and after November 1, 2017   10,000,000        
Letters of Credit Outstanding, Amount   1,800,000        
Line of Credit Facility, Fair Value of Amount Outstanding   0        
Performance Guarantee [Member] | Foreign Line of Credit [Member]            
Debt Instrument [Line Items]            
Line of Credit Facility, Fair Value of Amount Outstanding   0        
Privately Negotiated Transactions [Member]            
Debt Instrument [Line Items]            
Proceeds from convertible debt         $ 49,900,000  
Stock Repurchased and Retired During Period, Shares | shares 11,100,000          
TVN [Member]            
Debt Instrument [Line Items]            
Proceeds from convertible debt         $ 74,200,000  
Income Taxes Receivable   $ 26,500,000        
Loans Backed By French Research And Development Tax Credit Receivables [Member] | TVN [Member]            
Debt Instrument [Line Items]            
Debt Instrument, Interest Rate, Stated Percentage   0.60%        
Loans Payable to Bank   $ 16,700,000 17,700,000      
Adjusted EURIBOR Rate, Term   1 month        
Debt Instrument, Basis Spread on Variable Rate   1.30%        
Loans Backed By French Government Agencies for R&D Innovation Projects [Member] | TVN [Member]            
Debt Instrument [Line Items]            
Loans Payable to Bank   $ 2,100,000 $ 2,900,000      
London Interbank Offered Rate (LIBOR) [Member] | Revolving Credit Facility [Member] | Silicon Valley Bank [Member]            
Debt Instrument [Line Items]            
Debt Instrument, Basis Spread on Variable Rate   2.25%        
Not Comply with Liquidity Requirement [Member] | Prime Rate [Member] | Revolving Credit Facility [Member] | Silicon Valley Bank [Member]            
Debt Instrument [Line Items]            
Debt Instrument, Basis Spread on Variable Rate   0.25%        
Comply with Liquidity Requirement [Member] | Prime Rate [Member] | Revolving Credit Facility [Member] | Silicon Valley Bank [Member]            
Debt Instrument [Line Items]            
Debt Instrument, Basis Spread on Variable Rate   0.00%        
[1] Loans backed by French R&D tax credit receivables were $16.7 million and $17.7 million as of December 31, 2018 and 2017, respectively. As of December 31, 2018, the TVN French Subsidiary had an aggregate of $26.5 million of R&D tax credit receivables from the French government from 2019 through 2022. (See Note 9, “Certain Balance Sheet Components” for more information). These tax loans have a fixed rate of 0.6%, plus EURIBOR 1 month plus 1.3% and mature between 2019 through 2021. The remaining loans of $2.1 million and $2.9 million as of December 31, 2018 and 2017, respectively, primarily relate to financial support from French government agencies for R&D innovation projects at minimal interest rates, and the loans outstanding at December 31, 2018 mature between 2019 through 2025.